> Paul,
>
> Do you know of anyone using a Hy-Vo chain for power transmission with the
> Mazda?
>
> Steve Brazil
>
> I don't think anybody is currently flying with one.
> I know people have belt HiVo chain PSRU's but they tend to be heavy.
> This one, designed for a V8, weighs around 100 pounds as I recall.
> It is hear at SZP.
>
> -- Paul Lamar ...No rotor no motor.
>
> Paul,
> The biggest problem with the Hi-Vo chain is the geometry works like a
> gear,
> the teeth are involutes, so the sprockets must be steel. The chain
> requires
> an oil bath or spray bars which makes everything heavy. It is a strong
> and reliable
> system though.
> Bill Jepson


>Paul,

>I've pretty much given up the notion of trying to make the engine work
in a
>vertical installation.  I hate belts and these things are tough.
There will
>be no thrust or radial loads; all I need to do is get the power to the
>transmission (in a helicopter).  I think the unit could be fairly light,
>nowhere near the 70 to 100 lb the PRSU's do.  Do you know anyone who casts
>magnesium?

>Steve


>There are some in LA but I don't have any names or addresses

>Paul Lamar ...No rotor no motor.

Hi Steve,    Before you go off looking for a casting vendor, consider
going to your local boat yard/shop.  Snoop around for an outboard motor
lower unit or a dead inboard-outboard outdrive unit. The current crop of
new motors runs in excess of 300 HP and even 10 years ago were in
excess of 250 HP, all with inputs around the rotaries RPM range
of around 6000 RPM. In a serviceable or rebuildable unit you'll get the
90 degree turn of power so the engine runs in its normal attitude and
the output shaft is vertical. You also get the appropriately rated
bearings for the shaft speeds involved. The output shaft speed will
still be too fast for a helicopter rotor but it will be in the range
where a chain or belt reduction is doable without the need to make the
special design considerations necessary when accomodating a high RPM
pinion. Poke around the internet for a cutaway view, the engineering is
impressive.    Dave M

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